docs: def dew_point_from_db_hr(db_temp, hr, b_press=101325):
      """Dew Point Temperature (C) at Temperature db_temp (C),
      Humidity Ratio hr (kg water/kg air) and Pressure b_press (Pa).
      """
      rh = rel_humid_from_db_hr(db_temp, hr, b_press)
      td = dew_point_from_db_rh(db_temp, rh)
      return td